<template>
    <div>
        <!--面包屑导航区域-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!--卡片视图-->
        <el-card>
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
            <!--步骤条区域-->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!--tabs区域-->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" 
            label-width="100px" label-position="top">
                <el-tabs v-model="activeIndex" :tab-position="tabPosition='left'"
                :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                v-model="addForm.goods_cat"
                                :options="cateList"
                                :props="cateProps"
                                @change="handleChange"
                            >
                                
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!--渲染表单的Item项-->
                        <el-form-item v-for="item in manyTableData" :label="item.attr_name"
                        :key="item.attr_id">
                            <!--复选框组-->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox v-for="(cb, i) in item.attr_vals" :label="cb" 
                                :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!--action表示图片要上传的地址-->
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture"
                            :headers="headerObj"
                            :on-success="handleSuccess"
                            >
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!--富文本编辑器-->
                        <quill-editor
                        v-model="addForm.goods_introduce"
                        >

                        </quill-editor>
                        <!--添加商品的按钮-->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!--图片预览-->
        <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="50%"
            >
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>

    </div>
</template>

<script>
import _ from 'lodash'

export default {
    data(){
        return {
            activeIndex: '0',
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                goods_cat: [],
                pics: [],
                goods_introduce: '',// 商品的详情描述
                attrs: []
            },
            addFormRules: {
                goods_name: [
                    {required: true, message: '请输入商品名称', trigger: 'blur'}
                ],
                goods_price: [
                    {required: true, message: '请输入商品价格', trigger: 'blur'}
                ],
                goods_weight: [
                    {required: true, message: '请输入商品重量', trigger: 'blur'}
                ],
                goods_number: [
                    {required: true, message: '请输入商品数量', trigger: 'blur'}
                ],
                goods_cat: [
                    {required: true, message: '请输入商品分类', trigger: 'blur'}
                ]
            },
            cateList: [],
            cateProps: { 
                expandTrigger: 'hover',
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            manyTableData: [],// 动态参数列表数据
            onlyTableData: [],// 静态属性列表数据
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',// 图片上传路径
            headerObj: {
                'Authorization': window.sessionStorage.getItem('token')
            },
            previewPath: '',
            previewVisible: false,

        }
    },
    created(){
        this.getCateList()
    },
    computed: {
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    },
    methods: {
        async getCateList(){
           const {data: res} = await this.$http.get('/categories')
           if(res.meta.status !== 200){
                return this.$message.error('获取商品分类数据失败')
           }
           this.cateList = res.data
           console.log(res.data)
        },
        handleChange(){
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = []
            }
        },
        beforeTabLeave(activeName, oldActiveName){
           if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error('请先选择商品分类')
                return false
           }
        },
        async tabClicked(){
            if(this.activeIndex === '1'){
                // 动态参数面板
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
                    {params: {
                        sel: 'many'
                    }}
                )
                if(res.meta.status !== 200){
                    return this.$message.error('获取动态参数列表失败')
                }else{
                    res.data.forEach(item => {
                        item.attr_vals = 
                        item.attr_vals.length === 0 ?
                        [] : item.attr_vals.split(' ')
                    })
                    this.manyTableData = res.data
                }
            }else if(this.activeIndex === '2'){
                // 静态属性面板
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
                    {params: {
                        sel: 'only'
                    }}
                )
                if(res.meta.status !== 200){
                    return this.$message.error('获取动态参数列表失败')
                }else{
                    this.onlyTableData = res.data
                }
            }
        },
        handlePreview(file){
            // 处理图片预览
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        handleRemove(file){
            // 处理删除图片的事件
            const filePath = file.response.data.tmp_path
            const i = this.addForm.pics.findIndex(x => x.pic === filePath)
            this.addForm.pics.splice(i, 1)
            console.log(this.addForm)
        },
        handleSuccess(response){
            // 监听图片上传成功的事件
            const picInfo = {pic: response.data.tmp_path}
            this.addForm.pics.push(picInfo)
        },
        add(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid){
                    return this.$message.error('请填写必要的表单项')
                }else{
                    // 这里要对addForm做深拷贝,因为<el-cascase>的v-model的值必须是数组，
                    // 所以不能对addForm的goods_cat做逗号拼接
                    // lodash cloneDeep(obj)
                    const form = _.cloneDeep(this.addForm)
                    form.goods_cat = form.goods_cat.join(',')
                    // 处理动态参数和静态属性
                    this.manyTableData.forEach(item => {
                        const newInfo = {
                            attr_id: item.attr_id, 
                            attr_value: item.attr_vals.join(' ')}
                        this.addForm.attrs.push(newInfo)
                    })
                    this.onlyTableData.forEach(item => {
                        const newInfo = {
                            attr_id: item.attr_id,
                            attr_value: item.attr_vals
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    form.attrs = this.addForm.attrs
                    console.log(form)

                    // 商品的名称，必须唯一
                    const {data: res} = await this.$http.post('goods', form)
                    if(res.meta.status !== 201){
                        return this.$message.error('添加商品失败')
                    }else{
                        this.$message.success('添加商品成功')
                        this.$router.push('/goods')
                    }
                }
            })
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 5px 0 0 !important
}
.previewImg{
    width: 100%;
}

.btnAdd{
    margin-top: 15px;
}
</style>